102,400 ISO rodeo pic

Just thought I would post a high-end ISO pic from my D3s I took under low light conditions.

While it's not the best, I think its incredibale to have a FF camera with such high ISO and yet retain its diginity for detail. Lens used: 24-70/2.8. Am waiting on the Sigma 120-300/2.8.

One 'bitch' I do have however, is the camera's buffering under low light levels. I was shooting at 3 FPS and other times at 9 FPS and it took 'ages' for the images to write to the 90 MB/sec Sandisk FC. I've noticed this in day time as well. Is this normal or am I doing something wrong?